Charles l



(No Model.)

O. L. HOLDEN. HEATING APPARATUS FOR HOT WATER BOILERS. No. 576,313.

Patented Feb. 2

HVVENTOH WITNESSES:

NITED STATES PATENT .Orrrce.

CHARLES LJIIOLDEN, OF INDIANAPOLIS, INDIANA.

HEATING APPARATUS FOR HOT-WATER BOILERS.

SPECIFICATION formingpart of Letters Patent No. 576,313, dated February 2, 1897. Application filed February 11,1896. serial No. 578,911. (No model.)

To all whom it 71m cancer/1,: I

Be it known that'I, CHARLES L. HOLDEN, a citizen of the United States, residing at In dianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Heating Apparatus for HotWater Boilers, of which the following is a specification.

My invention relates to that class of devices commonly known as hot-water boilers, which are mostly employed in domestic use; and it consists especially in an improved heating apparatus therefor.

Said invention will be first fully described, and the novel features thereof then pointed out in the claims.

. Referring to the accompanying drawings, which are made a part hereof and on which similar letters and numerals of reference indicate similar parts, Figure 1. is a vertical sectional View of a hot-water boiler and the immediately adjacent parts, including the heating apparatus embodying my present i11- vention, and Fig. 2 a horizontal sectional view through said heating apparatus on an enlarged scale.

In said drawings the portions marked A represent the boiler proper or tank; B, the heating-chamber; O, the burner, andD ahood or casing for the heating-chamber and forming a combustion-chamber.

The tank, or boiler, as it .is usually termed, is or may be of any usual or desired construction. It is provided with the coldwater-ingress pipe 1 and the hot-water-egress pipe 2, which usually enter at the top. Circulating-pipes 3 and 4 connect this tank with the heating-chamber B, as shown, the pipe 3 leading from the bottom of the tank A to near 7 the bottom of the chamber B, and the pipe 4 leading from the top of the chamber B back into the tank A at any desired point higher up, so as to maintain a circulation.

The heating-chamber B is of apeculiar form and construction. It should be tapered, as shown, with the larger end upward when in position for use and decrease in size regularly toward the bottom, where it is provided with a screw-threaded bushing 17, forming the bottom, and to which a discharge-cock B is secured. As before stated, the pipe 3 enters this chamber at a point above its bottom, so

as to leave a space below into which sediment may settle, which may be discharged through said cock 13. Should the sediment become caked or solid in any way, the bushing b can be readily removed, which, being substantially the full size of the lower end, leaves an orifice large enough to easily remove any obstruction that may form. As the extreme lower end is always covered with water and generally with sediment, and as the ingresspipe and burner'are located above this point, there is no danger of the parts becoming fastened together by the action of the heat, while the sediment, not being subject to the direct action of the heat, remains in. a soft or loose condition and is easily discharged, whereas when such sediment comes directly against a part the opposite surface of which is exposed to flame it, as is well known, hecomes baked and hard and covered with lime or similar incrustation.

The burner C surrounds the chamber B and is formed to discharge the fuel-gas directly against the surface of said chamber, and the flame rises along the outer walls of said chamber toward the top, hugging it closely the entire length, the. latter result being aided by the flaring exterior of said chamber. A maximum result for the amount of heat employed isthus secured. The gas or other fluid fuel is supplied through the pipe 0.

The hood or casing D incloses that portion of the chamber B above the burner O, and its lower edge is shown as resting upon said burner, making a comparatively tight combustion-chamber; but this contact is not essential, as the casing may be of a different form and differently supported without departing from my invention. A tube or pipe D leads from the upper end of this casingD and preferably connects with a flue of the building, so as to carry off the fumes or products of combustion.

The operation is as follows: The water enters the tank A through the pipe 1 and is preferably carried thereby nearly to the lower end of said tank, as is usual. From the bottom of said tank it flows into the chamber B through the pipe 3 and is there effectually heated bythe flames from the burner O, which are driven against the exterior of said chamber. It then returns to the tank A through ICO the pipe 4: and rises to the top, whence it may be drawn off through the pipe 2. The fuel, preferably gas, enters the burner C from any convenient source of supply through the pipe C, and being ignited the resulting flame impinges against and closely hugs the exterior surface of the heater B. Said burner and the upper portion of the chamber being inclosed by the casing D the fumes and products of combustion are confined and prevented from escaping into the building. \Vhen it is desired to clean out the accumulated sediment, it is ordinarily only necessary to open the cock B, for reasons already stated; but if through carelessness or inattention the sediment is allowed to become hard or bulky it can always easily be removed by unscrewing the bushing 1).

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with a water-boiler, of a separate heating apparatus consisting of a chamber, circulating-pipes connecting said boiler and said chamber, and a burner surrounding said chamber at a point some distance above its lower end, wherebythe lower end below said burner may serve as a settling-chamber and not be in direct contact with the fire, substantially as described and for the purposes specified.

2. The combination with a boiler of a heating apparatus consisting of a chamber, a heater above the lower end of same, circulation-pipes connecting said boiler and chamber, the pipe leading into said chamber being connected therewith below said heater, substantially as set forth.

3. The combination with a boiler of a heatin g apparatus consisting of a tapered heatingchamber arranged with its large end upward, its lower end forming a settling-chamber with discharge devices, a burner surrounding said chamber above said lower end, and circulation-pipes connecting said boiler and chamber, substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 8th day of February, A. D. 1896.

CHARLES L. HOLDEN. 

